Question

In an optical fiber, the core material has a refractive index 1.6 and refractive index of cladding material is 1.3. calculate the value of acceptance angle.

Answer 1

acceptance angle = $\sin^{-1}(n_1^2-n_2^2)$ =$\sin^{-1}(2.56-1.69)=\sin^{-1}(0.87)=60.5^o$